Using this class you can make an iPhone behave like an iBeacon :)

Beacon.swift

import Foundation
import CoreBluetooth
import CoreLocation

class Beacon: NSObject {
    
    static let shared = Beacon()
    
    var localBeacon: CLBeaconRegion!
    var beaconPeripheralData: [String: AnyObject]?
    var peripheralManager: CBPeripheralManager!
    
    func startLocalBeacon() {
        if localBeacon != nil {
            stopLocalBeacon()
        }
        
        let localBeaconUUID = "5A4BCFCE-174E-4BAC-A814-092E77F6B7E5"
        let localBeaconMajor: CLBeaconMajorValue = 123
        let localBeaconMinor: CLBeaconMinorValue = 456
        let identifier = "mybeacon"
        
        let uuid = UUID(uuidString: localBeaconUUID)!
        localBeacon = CLBeaconRegion(proximityUUID: uuid, major: localBeaconMajor, minor: localBeaconMinor, identifier: identifier)
        
        beaconPeripheralData = localBeacon.peripheralData(withMeasuredPower: nil) as? [String: AnyObject]
        peripheralManager = CBPeripheralManager(delegate: self, queue: nil, options: nil)
    }
    
    func stopLocalBeacon() {
        peripheralManager.stopAdvertising()
        peripheralManager = nil
        beaconPeripheralData = nil
        localBeacon = nil
    }
}

extension Beacon: CBPeripheralManagerDelegate {
    
    func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
        if peripheral.state == .poweredOn {
            if let data = beaconPeripheralData {
                peripheralManager.startAdvertising(data)
            }
        } else if peripheral.state == .poweredOff {
            peripheralManager.stopAdvertising()
        }
    }
}